SAIT Flap Disc Encore 5 inch X 7/8 inch. Z, Type 27. 40 grit. 10 per pack. Part number 71226. General purpose specification - however, contains larger and more flaps than the competition providing longer life. Premium zirconium grain on cotton backing which provides long life and high stock removal. Will not contaminate stainless steel. Resists loading on aluminum. For use on Aluminum, Metal, Stainless. Max RPM: 12,200. Arbor: 7/8.